Reduced Cylinder Mode Operation; Injection Cranking - Komatsu 114E-3 Series Shop Manual

SEN00455-01
Reduced cylinder mode
a Reduced cylinder mode operation means to
run the engine with the fuel injectors of 1 or
more cylinders disabled electrically to reduce
the number of effective cylinders. The pur-
poses and effects of this operation are as fol-
lows.
1. This operation is used to find out a cylinder
which does not output power normally (or,
combustion in it is abnormal).
2. When a cylinder is selected for the reduced
cylinder mode operation, if the engine speed
and output do not change from the normal
operation (all-cylinder operation), that cylinder
has 1 or more defects.
The possible defects are as follows.
Leakage of compression through cylinder
q
head gasket
Defective injection
q
Defective piston, piston ring, and cylinder
q
liner
Defective valve mechanism (Moving valve
q
system)
Defect in electrical system
q
3. Since the common rail fuel injection system
controls the injector of each cylinder electroni-
cally, the operator can perform the reduced cyl-
inder mode operation easily with switches to
find out a defective cylinder.
a Perform the reduced cylinder mode opera-
tion with the engine mounted on the
machine or connected to INSITE (trouble-
shooting kit).
Before performing, see Testing method in
the shop manual for the machine or
INSITE (troubleshooting kit).
18
operation1 No-injection cranking
a No-injection cranking means to crank the
a Perform the no-injection cranking mode opera-
30 Testing and adjusting
engine with the starting motor while all the
injections are stopped electrically. The purpose
and effect of this operation are as follows.
Before the engine is started after it or the
engine has been stored for a long period, the
no-injection cranking is performed to lubricate
the engine parts and protect them from sei-
zure.
tion with the engine mounted on the machine
or connected to INSITE (troubleshooting kit).
Before performing, see Testing method in the
shop manual for the machine or INSITE (trou-
bleshooting kit).
1
114E-3 Series